216620415 has 48 divisors (see below), whose sum is σ = 418369536. Its totient is φ = 102782400.

The previous prime is 216620399. The next prime is 216620423. The reversal of 216620415 is 514026612.

216620415 is a `hidden beast` number, since 21 + 6 + 620 + 4 + 15 = 666.

It is not a de Polignac number, because 216620415 - 2⁴ = 216620399 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18610 + ... + 27920.

It is an arithmetic number, because the mean of its divisors is an integer number (8716032).

Almost surely, 2^216620415 is an apocalyptic number.

216620415 is a deficient number, since it is larger than the sum of its proper divisors (201749121).

216620415 is a wasteful number, since it uses less digits than its factorization.

216620415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9380 (or 9377 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 216620415 is about 14718.0302690272. The cubic root of 216620415 is about 600.5739092053.

The spelling of 216620415 in words is "two hundred sixteen million, six hundred twenty thousand, four hundred fifteen".